mamot.fr is one of the many independent Mastodon servers you can use to participate in the fediverse.
Mamot.fr est un serveur Mastodon francophone, géré par La Quadrature du Net.

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Antonin Delpeuch

@douginamug looks like the auto-link plugin would do the linking, but not the auto-completion. It's likely not possible to add this sort of auto-completion as in a mattermost plugin.
mattermost.com/marketplace/aut

Mattermost.comAutolink PluginAutomatically rewrite text matching a regular expression into a Markdown link